No.165 Gartshore inc. is a mail-order book company. The company recently changed its credit policy in an attempt to increase sales. Gartshore's variable cost ratio is 70 percent and its required rate of return is 12 percent. The company projects that annual sales will increase from the current level of $360,000 to $432,000, but the average collection period on receivables will go from 30 to 40 days. ignoring any tax implications, what is the cost of carrying the additional investment in accounts receivable, using a 360 day year?